[PATCH 0/5] fsi: Convert misc devs to proper chardevs and more

Benjamin Herrenschmidt benh at kernel.crashing.org
Tue Jul 24 15:05:14 AEST 2018

This converts the various FSI devices from misc dev to chardev,
as there can potentially be too much of them for misc devs limited
minors, and because there are some lifetime issues with the current

This provide a common infrastructure to allocate an FSI major and
distribute minors in a way that keeps it compatible with existing
userspace. A new representation grouping FSI devices under a
/dev/fsi directory is optinally provided, which will work in
conjunction with new udev scripts aimed at providing fixed ID
based symlinks.

A side effect of those conversions is to fix some object lifetime
issues caused by a mixup between devm_kzalloc and proper object

This series also adds a /dev{/fsi}/cfamN chardev for raw CFAM
access that will superseed the existing "raw" sysfs file.

Finally there's also a locking fix to avoid horrible mixups if
the "rescan" file is poked while a rescan is already in progress.

More information about the Linux-aspeed mailing list